- 1 [intransitive, transitive] to happen or to make something happen faster or earlier than expected Inflation continues to accelerate. accelerate something Exposure to the sun can accelerate the aging process.
- 2 [intransitive] (of a vehicle or person) to start to go faster The runners accelerated smoothly around the bend. The car accelerated to pass me. opposite decelerate
NAmE//əkˈsɛləˌreɪt//Verb Forms present simple I / you / we / they accelerate
he / she / it accelerates
past simple accelerated
-ing form accelerating